Wrench



(No Model.)

J. DU SHANE.

WRENCH.

No. 296.942. Patented Apr. 15, 1884.

flttorney 2% /F/ 7 a e WITNESSES UNITE STATES PATENT @rrrea.

JAMES DU SHANE, OF SOUTH BEND, INDIANA.

' WRENCH.

SPECIFICATION forming part of Letters Patent No. 296,942, dated April 15, 1884. Application filed November 30, 1883. (No model.)

To all whom it may concern,

Be it known that I, JAMEsDU SHANE, of South Bend, in the State of Indiana, have invented certain new and useful Improvements in .Wrenches; and I do hereby declare that the wrenches; and it consists in providing the movable jaw and its frame with a grooved threaded nut and screw-pin, in combination with the rack-barof the handle and fixed jaw, whereby a quick movement of the jaw can be effected and a very nice adjustment of the movable jaw obtained,as will be fully understood from the following descriptiomwhen taken in connection with the annexed drawings.

A designates the rack-bar of the wrench, having on one end a handle, on the other the fixed jaw B, and on one edge teeth a.

G designates the frame of the movable jaw D,which is adapted to slide on the rack-bar A, and which is constructed with a foot-piece, 1), parallel to the movable jaw.

E designates a screw, which is parallel to the toothed edge of the rack-bar, and which has its end hearings in the movable jaw D and foot piece b. This screw has applied on it a nut, F, and a collar, G, which latteris rigidly secured to the screw and bears against the foot I), and is used for keeping the screw in its bearings, and also for turning it. The cylindrical nut F, through which the screw E is tapped, has threads on its circumference adapted to engage with the teeth a of the rack-bar A, portions of which threads are cut away, as shown at 0, Fig. 1, to form a groove adapted to receive loosely the toothed edge of the rack-bar, and to allow the jaw D,with its frame, to slide freely on the rack-bar with a quick movement.

The operation of my wrench is as follows: The nutF is turned on its screw E until the toothed edge of therack-bar is received in the groove 0. The jaw D can then be quickly slid on the rackbar and moved up to the nut to be gripped, so as to confine it between the two jaws. The nut F is then turned and its threads caused to engage with the teeth of the rack-bar A, thus fixing the movable jaw on this bar. Now, by means of the screw E, the movable jaw is adjusted firmly and accurately against the nut. It will be observed that the movable jaw is held by the unbroken side of the threads of nut F, and theadj ustment of this jaw is perfected by turning the screw E as above described. Thepressure, when a nut is confined between the jaws of the wrench, passes through the upper part of the screw E .to the teeth a of the rack-bar, no pressure being on the collar G,whichlatter serves the double purpose of holding screw E in its bearings with the jaw D, and serving as a means whereby said screw can be turned for accurately adj usting jaw D to a nut, and as the collar G is held by a set-screw, c, it can be made to take up any lost motion in the parts, due to the wearing of the screw.

Although the threads of nut F are shown in Figs. 1 and 2 as perpendicular to its axis, it is evident that they may as well be spiral, as shown in Fig. 3,-and in this case,if the threads of the screwaxis run in the reverse directionz'. e., if they are left-handed while those of the nut are right-handed-this screw-axis may be stationary in the jaw, for thelead of its thread will then be added to that of the nut, and it will thus make up for the lead that has been lost by cutting away part of the threads of this adj Listing-nut. The movable jaw will thus become adjustable for any point along the rackbar, or, in other words, for any sized nut.

The action and principle of the deviceis the same as that first described-win, the compensation of the loss of lead occasioned by cutting away part of the threads of the adjustingnut by mounting and operating said nut on a threaded axis.

Having described my invention,what I claim as new, and desire to secure by Letters Patent, 1s-

1. In a nut or pipe wrench, the combination, with the rack-bar, of the fixed jaw, the movable-jaw frame,the screw therein,and a threaded nut on this screw having a groove in its periphery, all constructed and adapted to 0perate substantially in the manner and for the In testimony that I claim the foregoing as purposes described. my own I affix my signature in presence of two IO 2. The combinatiomwith the rack-bar, of the witnesses. fixed aw, the movableaw frame, the ad ust- JAMES DU SHANE 5 ing-serew having its bearings therein, the nut on this serewgmd the collar G,adjustztb1y fixed Witnesses: thereon, substantially as and for the purposes WILLIS A. BUGBEE, described. WILLIAM L. KIZER. 

